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KR101048129B1 - Catalytic Purge Device and Method - Google Patents

Catalytic Purge Device and Method Download PDF

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KR101048129B1
KR101048129B1 KR1020080103706A KR20080103706A KR101048129B1 KR 101048129 B1 KR101048129 B1 KR 101048129B1 KR 1020080103706 A KR1020080103706 A KR 1020080103706A KR 20080103706 A KR20080103706 A KR 20080103706A KR 101048129 B1 KR101048129 B1 KR 101048129B1
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catalyst
oxygen sensor
control
fuel
value
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KR20100044531A (en
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조창희
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현대자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

본 발명은 연료차단제어(Fuel Cut Control)가 종료된 이후 촉매의 정화효율을 높이기 위해 전/후방 산소센서의 신호 감지를 통해 촉매의 퍼지제어를 실행하는 것이다.The present invention executes the purge control of the catalyst through the detection of the signal of the front / rear oxygen sensor to increase the purification efficiency of the catalyst after the fuel cut control (Fiel Cut Control) is finished.

본 발명은 연료차단제어가 해제되면 제2산소센서의 출력값을 적산하여 적산값이 설정된 최소 임계값 이상인지 판단하는 과정, 적산값이 최소 임계값 이상이면 제1산소센서의 출력이 희박 연소로 검출되는지 판단하는 과정, 제1산소센서의 출력이 희박 연소로 검출되면 제2산소센서의 적산값에 따라 보정 펙터값의 연료량을 결정하여 농후한 연료 분사를 통해 촉매 퍼지제어를 실행하는 과정, 촉매의 퍼지제어 상태에서 제2산소센서의 출력 적산값이 최대 임계값 이상이고 제1산소센서의 출력이 농후 연소로 검출되면 촉매 퍼지제어를 해제한 다음 공연비 제어를 실행하는 과정을 포함한다.According to the present invention, when the fuel cutoff control is released, the output value of the second oxygen sensor is integrated to determine whether the integrated value is greater than or equal to the set minimum threshold value. If the integrated value is greater than or equal to the minimum threshold value, the output of the first oxygen sensor is detected as lean combustion. If the output of the first oxygen sensor is detected as lean combustion, the fuel amount of the correction factor value is determined according to the integration value of the second oxygen sensor, and the catalyst purge control is performed through the rich fuel injection. In the purge control state, when the output integration value of the second oxygen sensor is greater than or equal to the maximum threshold value and the output of the first oxygen sensor is detected as rich combustion, the process includes releasing the catalyst purge control and then performing the air-fuel ratio control.

촉매퍼지, 연료차단제어, 산소 과충전, 공연비, 제1,2산소센서 Catalyst purge, fuel cutoff control, oxygen overcharge, air-fuel ratio, first and second oxygen sensors

Description

촉매 퍼지장치 및 방법{SYSTEM AND METHOD FOR CATALYST PURGE CONTROL}Catalytic purge system and method {SYSTEM AND METHOD FOR CATALYST PURGE CONTROL}

본 발명은 촉매 퍼지장치에 관한 것으로, 더 상세하게는 연료차단제어(Fuel Cut Control)가 종료된 이후 촉매의 정화효율을 높이기 위해 전/후방 산소센서의 신호 감지를 통해 촉매의 퍼지제어를 실행하는 촉매 퍼지장치 및 방법에 관한 것이다.The present invention relates to a catalyst purge apparatus, and more particularly, to purge the catalyst through signal detection of the front and rear oxygen sensors to increase the purification efficiency of the catalyst after the fuel cut control is terminated. A catalyst purge apparatus and method are disclosed.

일반적으로, 촉매는 배기가스에 포함된 NOx, HC, CO 등의 유해물질을 산화 혹은 환원시켜 에미션(Emission)을 안정되게 유지시키는 것으로, 강화되는 북미의 OBD-Ⅱ 규제나 유로의 배기가스 규제에 따라 촉매의 기능이 아주 중요한 역할을 하고 있다.In general, catalysts oxidize or reduce harmful substances such as NOx, HC, and CO contained in exhaust gas to maintain emission stability. North American OBD-II regulation and euro exhaust gas regulation are strengthened. Thus, the function of the catalyst plays a very important role.

촉매는 파워 오프 업 시프트(Power Off Up shift) 등에 의해 연료차단제어가 실행되면 희박한 연료로 인하여 촉매는 최대 산소저장능력(OSC : Oxygen Storage Capacity) 만큼 과충전이 된다.When the fuel cut control is executed by a power off up shift, the catalyst is overcharged by the maximum oxygen storage capacity (OSC) due to the lean fuel.

그러므로, 촉매는 연료차단제어 이후 정상 분사로 복귀되는 경우 과충전된 산소로 인해 본래의 정화효율을 갖지 못하고 다량의 배출가스(NOx)를 그대로 방출하게 된다.Therefore, when the catalyst returns to the normal injection after the fuel cut control, the catalyst does not have the original purification efficiency due to the overcharged oxygen and emits a large amount of exhaust gas (NOx) as it is.

따라서, 연료차단제어 이후 촉매의 정화효율을 안정되게 유지시키기 위해서는 연료차단제어의 과정에서 촉매에 과충전된 산소를 신속하게 제거해야 한다.Therefore, in order to maintain the purification efficiency of the catalyst stably after the fuel cut control, it is necessary to quickly remove the overcharged oxygen in the catalyst during the fuel cut control process.

종래의 폐쇄 루프(Close Loop)제어에서는 도 3에 도시된 바와 같이, 연료차단제어의 종료 직후 바로 공연비 제어(Lambda Control)를 재개하고, 일반적인 공연비 제어에서 사용되는 피 점프 지연(P-jump Delay)제어에서 피 점프 지연지속(P-jump Delay Rich Duration)으로 보정한다.In the conventional Close Loop control, as shown in FIG. 3, the air-fuel ratio control is resumed immediately after the end of the fuel cut control, and the P-jump delay used in the general air-fuel ratio control is performed. The control compensates for P-jump Delay Rich Duration.

즉, 일정 시간 동안 공연비를 농후한 상태로 제어하여 과충전 산소를 제거하는 것이다.In other words, by controlling the air-fuel ratio in a rich state for a certain time to remove the overcharge oxygen.

그러나, 이러한 방법은 연료차단제어의 종료 이후 과급 효과가 부족하여 발진에서 NOx 에미션을 과다하게 발생시키는 문제점이 있다.However, this method has a problem of excessive generation of NOx emission in oscillation due to lack of a supercharge effect after the end of the fuel cut control.

또한, 개방 루프(Open Loop)제어에서는 도 4에 도시된 바와 같이, 연료차단제어가 종료된 이후 파일롯(Pilot) 분사가 이루어진다. In addition, in the open loop control, pilot injection is performed after the fuel cut control is completed, as shown in FIG. 4.

즉, 공연비 제어를 바로 재개하지 않고, 일정시간 동안 목표 공연비를 1보다 작은 임의의 값으로 정하여 인위적으로 농후하게 연료가 분사되도록 제어함으로써, 촉매에 과충전 산소를 제거하는 방법이다.That is, it is a method of removing overcharged oxygen to the catalyst by controlling fuel injection to be artificially enriched by setting the target air-fuel ratio to an arbitrary value less than 1 for a predetermined time without immediately restarting the air-fuel ratio control.

그러나, 이러한 방법 역시 정확한 촉매의 퍼지제어가 이루어지지 못하고, 상황에 따라 능동적인 대응이 제공되지 못하는 문제점이 있다.However, this method also has a problem in that the precise control of the purge of the catalyst is not achieved, and the active response is not provided depending on the situation.

본 발명은 상기한 문제점을 해결하기 위하여 발명한 것으로, 그 목적은 연료 차단제어(Fuel Cut Control)가 종료된 이후 촉매의 정화효율을 높이기 위해 전/후방 산소센서의 신호 감지를 통해 인위적으로 농후하게 연료를 분사하여 촉매의 퍼지제어가 신속하고 안정적으로 실행되도록 하는 것이다.The present invention has been invented to solve the above problems, the purpose of which is artificially rich through the signal detection of the front and rear oxygen sensor to increase the purification efficiency of the catalyst after the fuel cut control (Fiel Cut Control) is terminated. By injecting fuel, the purge control of the catalyst is executed quickly and stably.

상기한 목적을 실현하기 위한 본 발명의 특징에 따른 촉매 퍼지장치는, 엔진; 산화 및 환원 작용으로 배기가스를 정화하는 촉매; 촉매의 전후방에 설치되는 제1,2산소센서; 촉매의 온도를 검출하는 온도센서를 포함하며,Catalyst purge device according to a feature of the present invention for achieving the above object, the engine; A catalyst for purifying exhaust gas by oxidation and reduction action; First and second oxygen sensors installed before and after the catalyst; It includes a temperature sensor for detecting the temperature of the catalyst,

연료차단제어가 해제되면 제1,2산소센서의 신호에 따라 연료를 농후하게 분사시켜 촉매를 퍼지시키는 ECU를 포함한다. When the fuel cutoff control is released, the control unit includes an ECU which purges the catalyst by injecting the fuel in a rich manner according to the signals of the first and second oxygen sensors.

또한, 본 발명의 특징에 따른 촉매 퍼지방법은, 연료차단제어가 해제되면 제2산소센서의 출력값을 적산하여 적산값이 설정된 최소 임계값 이상인지 판단하는 과정; 적산값이 최소 임계값 이상이면 제1산소센서의 출력이 희박 연소로 검출되는지 판단하는 과정; 제1산소센서의 출력이 희박 연소로 검출되면 제2산소센서의 적산값에 따라 보정 펙터값의 연료량을 결정하여 촉매 퍼지제어를 실행하는 과정; 촉매의 퍼지제어 상태에서 제2산소센서의 출력 적산값이 최대 임계값 이상이고 제1산소센서의 출력이 농후 연소로 검출되면 촉매 퍼지제어를 해제한 다음 공연비 제어를 실행하는 과정을 포함한다.In addition, the catalyst purge method according to an aspect of the present invention, when the fuel cut control is released, the process of determining whether the integrated value is greater than the set minimum threshold value by integrating the output value of the second oxygen sensor; Determining whether the output of the first oxygen sensor is detected as lean combustion when the integrated value is greater than or equal to the minimum threshold value; If the output of the first oxygen sensor is detected as lean combustion, performing the catalyst purge control by determining the fuel amount of the correction factor value according to the integrated value of the second oxygen sensor; And if the output integration value of the second oxygen sensor is greater than or equal to the maximum threshold value and the output of the first oxygen sensor is detected as rich combustion in the purge control state of the catalyst, then the catalyst purge control is cancelled and then the air-fuel ratio control is executed.

전술한 구성에 의하여 본 발명은 연료차단제어 이후 피드백 공연비 제어를 실행하지 않고 전후방 산소센서의 신호에 따라 인위적으로 연료를 농후하게 분사하 여 촉매의 퍼지제어를 실행함으로써 과충전된 산소를 신속하고 안정되게 퍼지시키는 효과를 기대할 수 있다.According to the above-described configuration, the present invention does not execute the feedback air-fuel ratio control after the fuel cut control, and artificially injects fuel richly in accordance with the signals of the front and rear oxygen sensors to carry out the purge control of the catalyst to quickly and stably overcharge the oxygen. The fuzzy effect can be expected.

아래에서는 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

본 발명은 여러 가지 상이한 형태로 구현될 수 있으므로 여기에서 설명하는 실시예에 한정되지 않으며, 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였다.Since the present invention can be implemented in various different forms, the present invention is not limited to the exemplary embodiments described herein, and parts not related to the description are omitted in the drawings in order to clearly describe the present invention.

도 1은 본 발명의 실시예에 따른 촉매 퍼지장치의 개략적인 구성을 도시한 도면이다.1 is a view showing a schematic configuration of a catalyst purge device according to an embodiment of the present invention.

본 발명은 제1산소센서(110)와 제2산소센서(120), 온도센서(130), 수온센서(140), ETC(150), 인젝터(160), 점화 플러그(170), 촉매(200) 및 ECU(300)를 포함한다.The present invention is the first oxygen sensor 110 and the second oxygen sensor 120, temperature sensor 130, water temperature sensor 140, ETC 150, injector 160, spark plug 170, catalyst 200 ) And the ECU 300.

제1산소센서(110)는 촉매(200)의 전방에 장착되어 엔진(100)에서 배출되는 배기가스에 포함된 산소농도를 검출하여 그에 대한 정보를 ECU(300)에 제공한다.The first oxygen sensor 110 is mounted in front of the catalyst 200 to detect the oxygen concentration contained in the exhaust gas discharged from the engine 100 and provide information about the oxygen to the ECU 300.

제2산소센서(120)는 촉매(200)의 후방에 장착되어 촉매(200)를 통해 정화된 배기가스에 포함된 산소농도를 검출하여 그에 대한 정보를 ECU(300)에 제공한다.The second oxygen sensor 120 is mounted to the rear of the catalyst 200 to detect the oxygen concentration contained in the exhaust gas purified through the catalyst 200 and provide information about the oxygen to the ECU 300.

온도센서(130)는 촉매(200)의 하류측에 장착되어 촉매(200)의 온도를 검출하여 그에 대한 정보를 ECU(300)에 제공한다.The temperature sensor 130 is mounted downstream of the catalyst 200 to detect the temperature of the catalyst 200 and provide information about the temperature to the ECU 300.

수온센서(140)는 엔진(100)을 순환하는 냉각수의 온도를 검출하여 그에 대한 정보를 ECU(300)에 제공한다.The water temperature sensor 140 detects a temperature of the coolant circulating in the engine 100 and provides information about the temperature to the ECU 300.

ETC(150)는 ECU(300)에서 인가되는 제어신호에 의해 동작되어 스로틀 밸브의 개도량, 즉 엔진(100)에 흡입되는 공기량을 조정한다.The ETC 150 is operated by a control signal applied from the ECU 300 to adjust the opening amount of the throttle valve, that is, the amount of air sucked into the engine 100.

상기 ETC(150)의 동작은 도시되지 않은 가속페달센서에서 검출되는 가속페달의 변위에 따라 결정된다.The operation of the ETC 150 is determined according to the displacement of the accelerator pedal detected by the accelerator pedal sensor (not shown).

인젝터(160)는 ECU(300)에서 인가되는 제어신호에 의해 개폐되어 현재의 운전조건에 따라 결정되는 연료량을 연소실에 분사한다.The injector 160 is opened and closed by a control signal applied from the ECU 300 to inject the fuel amount determined in accordance with the current operating conditions to the combustion chamber.

점화 플러그(170)는 ECU(300)의 제어에 따라 연소실에 불꽃 방전을 제공하여 혼합기의 연소가 이루어질 수 있도록 한다.The spark plug 170 provides flame discharge to the combustion chamber under the control of the ECU 300 to allow combustion of the mixer.

촉매(200)는 엔진(100)에서 배출되는 배기가스에 포함된 NOx, HC, CO 등의 유해한 물질을 산화 및 환원시켜 에미션을 안정되게 한다.The catalyst 200 stabilizes the emission by oxidizing and reducing harmful substances such as NOx, HC, and CO included in the exhaust gas discharged from the engine 100.

ECU(300)는 엔진(100)의 제반적인 동작을 제어하며, 파워 오프 업 시프트 등의 조건에 의해 연료차단제어가 실행된 다음 정상적인 연료 분사로 복귀되면 촉매(200)의 전/후방에 설치된 제1,2산소센서(110)(120)의 신호에 따라 인위적으로 연료를 농후하게 분사시켜, 연료차단제어가 실행되는 과정에서 촉매(200)에 과충전된 산소를 신속하고 안정되게 퍼지 시킨다.The ECU 300 controls the overall operation of the engine 100. When the fuel cut control is executed by a condition such as a power off up shift and then returns to normal fuel injection, the ECU 300 is installed at the front and rear of the catalyst 200. In accordance with the signals of the first and second oxygen sensor 110, 120 artificially injected fuel rich, it is possible to quickly and stably purge the overcharged oxygen to the catalyst 200 in the process of the fuel cut control.

전술한 바와 같은 기능을 포함하는 본 발명의 동작은 다음과 같다.The operation of the present invention including the function as described above is as follows.

엔진(100)의 시동이 온을 유지하는 상태에서 ECU(300)는 현재의 운전모드를 검출하여(S101) 파워 온 업 시프트 등에 의해 실행되었던 연료차단제어가 해제되었 는지 판단한다(S102).In the state where the start of the engine 100 is kept on, the ECU 300 detects the current operation mode (S101) and determines whether the fuel cutoff control performed by the power on up shift or the like has been released (S102).

상기 S102의 판단에서 연료차단제어가 해제되었으면 촉매(200)의 전/후방에 설치되는 제1,2산소센서(110)(120) 및 온도센서(130)의 신호를 검출하여(S103), 제2산소센서(120)가 가열되고 있는지 판단한다(S104).When the fuel cutoff control is released in the determination of S102, signals of the first and second oxygen sensors 110 and 120 and the temperature sensor 130 installed at the front and rear of the catalyst 200 are detected (S103). It is determined whether the oxygen sensor 120 is being heated (S104).

상기 S104의 판단에서 제2산소센서(120)가 가열되고 있는 상태이면 촉매(200)의 온도가 설정된 최저 임계값 이상을 유지하는지 판단한다(S105).If the second oxygen sensor 120 is heated in the determination of S104, it is determined whether the temperature of the catalyst 200 is maintained above a set minimum threshold value (S105).

상기 S104의 판단에서 제2산소센서(120)가 가열되지 않은 상태이거나 상기 S105의 판단에서 촉매(200)의 온도가 설정된 최저 임계값 미만이면 촉매 퍼지를 위한 동작을 실행하지 않는다.When the second oxygen sensor 120 is not heated in the determination of S104 or when the temperature of the catalyst 200 is lower than the set minimum threshold value in the determination of S105, the operation for purging the catalyst is not performed.

상기 S105의 판단에서 촉매(200)의 온도가 설정된 최저 임계값 이상을 유지하는 상태이면 제2산소센서(120)의 출력신호를 시간의 흐름에 따라 적산하고(S106), 제2산소센서(120)의 적산된 값이 설정된 최저 임계값 이상을 유지하는지 판단한다(S107).When the temperature of the catalyst 200 is maintained at a predetermined threshold or more in the determination of S105, the output signal of the second oxygen sensor 120 is integrated over time (S106), and the second oxygen sensor 120 is integrated. In step S107, it is determined whether the integrated value of) is maintained above the set minimum threshold value.

상기 S107의 판단에서 제2산소센서(120)의 적산된 값이 설정된 최저 임계값 미만이면 상기S106의 단계로 리턴하여 적산과정을 반복하고, 적산된 값이 설정된 최저 임계값 이상이면 제1산소센서(110)의 출력값이 설정된 최대 임계값 이하인지, 즉 희박 연소 상태인지를 판단한다(S108).If the integrated value of the second oxygen sensor 120 is less than the set minimum threshold in the determination of S107, the process returns to step S106 to repeat the integration process, and if the integrated value is greater than or equal to the set minimum threshold, the first oxygen sensor It is determined whether the output value of 110 is equal to or less than a set maximum threshold value, that is, a lean burn state (S108).

상기 S108의 판단에서 제1산소센서(110)의 출력값이 설정된 최대 임계값 이하, 즉 희박 연소의 상태이면 적산된 제2산소센서(120)의 신호값에 따라 보정 펙터 맵에서 촉매 퍼지량의 연료량을 결정한 다음 인젝터(160)를 제어하여 촉매(200)의 퍼지제어를 실행한다(S109).If the output value of the first oxygen sensor 110 is less than the set maximum threshold value, that is, in the state of lean combustion in the determination of S108, the fuel amount of the catalyst purge amount in the correction factor map according to the signal value of the integrated second oxygen sensor 120. After the determination, the injector 160 is controlled to perform purge control of the catalyst 200 (S109).

즉, ECU(300)는 연료차단제어의 실행과정에서 촉매(200)에 과충전된 산소를 퍼지시키기 위하여 결정된 과농한 연료량을 분사시켜 신속하고 안정된 퍼지제어가 실행되도록 한다.That is, the ECU 300 injects an excessive amount of fuel determined to purge the overcharged oxygen to the catalyst 200 during the execution of the fuel cutoff control, so that the fast and stable purge control is executed.

상기한 바와 같이 과농한 연료량의 분사를 통해 촉매(200)를 퍼지제어하는 과정에서 촉매(200)의 과열방지로직이 작동되었는지 판단한다(S110). As described above, it is determined whether the overheat prevention logic of the catalyst 200 is operated in the process of purging the catalyst 200 through the injection of the excessive fuel amount (S110).

상기 S110의 판단에서 과열방지로직이 작동되지 않았으면 엔진(100)이 전부하의 상태인지 판단한다(S111).If the overheat prevention logic is not operated in the determination of S110 it is determined whether the engine 100 is in a full load state (S111).

상기 S110의 판단에서 과열방지로직이 작동되었거나 상기 S111의 판단에서 전후하의 상태이면 촉매(200)의 퍼지제어를 종료한다.The purge control of the catalyst 200 is terminated when the overheat prevention logic is activated in the determination of S110 or before and after the state in the determination of S111.

상기 S111의 판단에서 엔진(100)이 전부하의 상태가 아니면 제2산소센서(120)의 적산값이 설정된 최대 임계값 이상인지 판단한다(S112).If the engine 100 is not at full load in the determination of S111, it is determined whether the integrated value of the second oxygen sensor 120 is equal to or greater than the set maximum threshold value (S112).

상기 S112의 판단에서 제2산소센서(120)의 적산값이 설정된 최대 임계값 이상이면 제1산소센서(110)의 출력값이 설정된 최소 임계값 이상, 즉 농후 연소의 상태인지를 판단한다(S113).If the integrated value of the second oxygen sensor 120 is greater than or equal to the set maximum threshold in the determination of S112, it is determined whether the output value of the first oxygen sensor 110 is greater than or equal to the set minimum threshold, that is, a state of rich combustion (S113). .

상기 S112의 판단에서 제2산소센서(120)의 적산값이 최대 임계값 미만이거나 상기 S113의 판단에서 제1산소센서(110)의 출력값이 설정된 최소 임계값 미만, 희박 연소의 상태이면 촉매(200)의 퍼지제어를 지속적으로 유지한다. If the integrated value of the second oxygen sensor 120 is less than the maximum threshold value in the determination of S112 or if the output value of the first oxygen sensor 110 is less than the set minimum threshold value or the lean combustion state in the determination of S113, the catalyst 200 Keep the fuzzy control of

상기 S113의 판단에서 제1산소센서(110)의 출력값이 설정된 최소 임계값 이상, 즉 농후 연소의 상태이면 촉매(200)의 퍼지제어를 종료하고, 정상적인 공연비 제어를 실행한다(S114).If the output value of the first oxygen sensor 110 is greater than the set minimum threshold value, that is, in the state of rich combustion in the determination of S113, the purge control of the catalyst 200 is terminated and normal air-fuel ratio control is executed (S114).

이상에서 본 발명의 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것은 아니고 다음의 청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 형태 또한 본 발명의 권리범위에 포함된다.Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It is included in the scope of rights.

도 1은 본 발명의 실시예에 따른 촉매 퍼지장치의 개략적인 구성을 도시한 도면이다.1 is a view showing a schematic configuration of a catalyst purge device according to an embodiment of the present invention.

도 2는 본 발명의 실시예에 따른 촉매 퍼지 절차를 도시한 흐름도이다.2 is a flow chart illustrating a catalyst purge procedure in accordance with an embodiment of the present invention.

도 3은 종래의 폐쇄 루프제어에 따른 촉매의 정화특성을 도시한 도면이다.3 is a view showing the purification characteristics of the catalyst according to the conventional closed loop control.

도 4는 종래의 개방 루프제어에 따른 촉매의 정화특성을 도시한 도면이다.4 is a view showing the purification characteristics of the catalyst according to the conventional open loop control.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

110 : 제1산소센서 120 : 제2산소센서110: first oxygen sensor 120: second oxygen sensor

130 : 온도센서 140 : 수온센서130: temperature sensor 140: water temperature sensor

150 : ETC 160 : 인젝터150: ETC 160: Injector

170 : 점화 플러그 200 : ECU 170: spark plug 200: ECU

Claims (8)

삭제delete 엔진; 산화 및 환원 작용으로 배기가스를 정화하는 촉매; 촉매의 전후방에 설치되는 제1,2산소센서; 촉매의 온도를 검출하는 온도센서; 연료차단제어가 해제되면 제1,2산소센서의 신호에 따라 연료를 농후하게 분사시켜 촉매를 퍼지시키는 ECU를 포함하는 촉매 퍼지장치에 있어서,engine; A catalyst for purifying exhaust gas by oxidation and reduction action; First and second oxygen sensors installed before and after the catalyst; A temperature sensor for detecting the temperature of the catalyst; In the catalyst purge device comprising an ECU for purging the catalyst by injecting the fuel richly in accordance with the signal of the first and second oxygen sensor when the fuel cut control is released, 상기 ECU는 연료차단제어가 해제되면 제2산소센서의 출력값을 적산하여 적산값이 설정된 최소 임계값 이상이고, 제1산소센서의 출력이 희박 연소로 검출되면 제2산소센서의 적산값에 따라 보정 펙터값의 연료량을 결정하여 과농한 연료의 분사로 촉매 퍼지제어를 실행하는 것을 특징으로 하는 촉매 퍼지장치.When the fuel cutoff control is released, the ECU integrates the output value of the second oxygen sensor and corrects the integrated value of the second oxygen sensor when the output value of the first oxygen sensor is detected as lean combustion. A catalyst purge device, characterized in that the catalyst purge control is performed by injecting excessive fuel by determining the fuel amount of the factor value. 엔진; 산화 및 환원 작용으로 배기가스를 정화하는 촉매; 촉매의 전후방에 설치되는 제1,2산소센서; 촉매의 온도를 검출하는 온도센서; 연료차단제어가 해제되면 제1,2산소센서의 신호에 따라 연료를 농후하게 분사시켜 촉매를 퍼지시키는 ECU를 포함하는 촉매 퍼지장치에 있어서,engine; A catalyst for purifying exhaust gas by oxidation and reduction action; First and second oxygen sensors installed before and after the catalyst; A temperature sensor for detecting the temperature of the catalyst; In the catalyst purge device comprising an ECU for purging the catalyst by injecting the fuel richly in accordance with the signal of the first and second oxygen sensor when the fuel cut control is released, 상기 ECU는 촉매 퍼지제어의 상태에서 제2산소센서의 출력 적산값이 설정된 최대 임계값 이상이고, 제1산소센서의 출력이 농후 연소로 검출되면 촉매 퍼지제어를 해제하는 것을 특징으로 하는 촉매 퍼지장치.The ECU purges the catalyst purge control when the output integration value of the second oxygen sensor is equal to or greater than the set maximum threshold value in the state of the catalyst purge control and the output of the first oxygen sensor is detected as rich combustion. . 엔진; 산화 및 환원 작용으로 배기가스를 정화하는 촉매; 촉매의 전후방에 설치되는 제1,2산소센서; 촉매의 온도를 검출하는 온도센서; 연료차단제어가 해제되면 제1,2산소센서의 신호에 따라 연료를 농후하게 분사시켜 촉매를 퍼지시키는 ECU를 포함하는 촉매 퍼지장치에 있어서,engine; A catalyst for purifying exhaust gas by oxidation and reduction action; First and second oxygen sensors installed before and after the catalyst; A temperature sensor for detecting the temperature of the catalyst; In the catalyst purge device comprising an ECU for purging the catalyst by injecting the fuel richly in accordance with the signal of the first and second oxygen sensor when the fuel cut control is released, 상기 ECU는 촉매 퍼지제어의 상태에서 과열방지로직이 작동하면 퍼지제어를 종료하는 것을 특징으로 하는 촉매 퍼지장치.And said ECU terminates purge control when the overheat prevention logic operates in the state of catalyst purge control. 엔진; 산화 및 환원 작용으로 배기가스를 정화하는 촉매; 촉매의 전후방에 설치되는 제1,2산소센서; 촉매의 온도를 검출하는 온도센서; 연료차단제어가 해제되면 제1,2산소센서의 신호에 따라 연료를 농후하게 분사시켜 촉매를 퍼지시키는 ECU를 포함하는 촉매 퍼지장치에 있어서,engine; A catalyst for purifying exhaust gas by oxidation and reduction action; First and second oxygen sensors installed before and after the catalyst; A temperature sensor for detecting the temperature of the catalyst; In the catalyst purge device comprising an ECU for purging the catalyst by injecting the fuel richly in accordance with the signal of the first and second oxygen sensor when the fuel cut control is released, 상기 ECU는 촉매 퍼지제어의 상태에서 전부하에 진입되면 퍼지제어를 종료하는 것을 특징으로 하는 촉매 퍼지장치.The ECU purging the purge control when the full load is entered in the state of the catalyst purge control. 연료차단제어가 해제되면 제2산소센서의 출력값을 적산하여 적산값이 설정된 최소 임계값 이상인지 판단하는 과정;Determining whether the integrated value is equal to or greater than a set minimum threshold value by integrating an output value of the second oxygen sensor when the fuel cutoff control is released; 적산값이 최소 임계값 이상이면 제1산소센서의 출력이 희박 연소로 검출되는지 판단하는 과정;Determining whether the output of the first oxygen sensor is detected as lean combustion when the integrated value is greater than or equal to the minimum threshold value; 제1산소센서의 출력이 희박 연소로 검출되면 제2산소센서의 적산값에 따라 보정 펙터값의 연료량을 결정하여 과농한 연료의 분사를 통해 촉매 퍼지제어를 실행하는 과정;If the output of the first oxygen sensor is detected as lean combustion, determining the fuel amount of the correction factor value according to the integration value of the second oxygen sensor and performing catalyst purge control through injection of excess fuel; 촉매의 퍼지제어 상태에서 제2산소센서의 출력 적산값이 최대 임계값 이상이고 제1산소센서의 출력이 농후 연소로 검출되면 촉매 퍼지제어를 해제한 다음 공연비 제어를 실행하는 과정;In the purge control state of the catalyst, when the output integration value of the second oxygen sensor is greater than or equal to the maximum threshold value and the output of the first oxygen sensor is detected as rich combustion, canceling the catalyst purge control and then performing air-fuel ratio control; 을 포함하는 촉매 퍼지방법.Catalyst purge method comprising a. 제6항에 있어서,The method of claim 6, 상기 촉매 퍼지제어가 실행되는 상태에서 촉매 과열방지로직이 작동되면 촉매 퍼지제어를 종료하는 과정을 더 포함하는 촉매 퍼지방법.And purging the catalyst purge control when the catalyst overheat prevention logic is operated while the catalyst purge control is executed. 제6항에 있어서,The method of claim 6, 상기 촉매 퍼지제어가 실행되는 상태에서 전부하의 운행이 검출되면 촉매 처지제어를 종료하는 과정을 더 포함하는 촉매 퍼지방법.The catalyst purge method further comprises the step of terminating the catalyst sag control when the operation of the full load is detected in the state that the catalyst purge control is executed.
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